Just had a most interesting run to Reading on the 17.45 ex Plymouth which would rival any commuter train in terms of overcrowding when an extra pick up only stop for Glastonbury was made at Castle Cary tonight.
Just wondered what the guidance is to train staff re this sort of overcrowding due to event like this

?
in answer to your question the train crew decide if it is safe to run,if they deem it unsafe the have the right to refuse to work it.
as far as the company are concerned it is safer to be fully loaded up as people do not get thrown around in the event of an accident (or so i am led to beleive)